Muffler with catalyst for internal combustion engine
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United States of America Patent
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Apr 1, 1986
Grant Date -
N/A
app pub date -
Feb 26, 1985
filing date -
Mar 1, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A muffler for internal combustion engine houses a catalyst for exhaust gas purification and is provided with an exhaust gas inlet pipe through which exhaust gas from the engine is fed to the upstream side of the catalyst. The exhaust gas inlet pipe includes an inlet pipe section provided therein with a venturi section through which atmospheric air as secondary air is inducted into the exhaust gas inlet pipe. The inlet pipe section is extended in the direction of exhaust gas flow to form an extension pipe section which has a length of at least two times the inner diameter of the extension pipe section, thereby suppressing cutoff frequency at lower levels.
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